MAX5938 -48V Hot-Swap Controller with VIN Step Immunity, No RSENSE, and Overvoltage Protection

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The MAX5938 is a hot-swap controller for -10V to -80V rails. The MAX5938 allows circuit line cards to be safely hot-plugged into a live backplane without causing a glitch on the power supply. It integrates an adjustable circuit-breaker function requiring no R_SENSE.

The MAX5938 provides a controlled turn-on for circuit cards, which limits inrush current and prevents both glitches on the power-supply rail and damage to board connectors and components. Before startup, the MAX5938 performs a Load Probe™ test to detect the presence of a short-circuit condition. If a short-circuit condition does not exist, the device limits the inrush current drawn by the load by gradually turning on the external MOSFET. Once the external MOSFET is fully enhanced, the MAX5938 provides overcurrent and shortcircuit protection by monitoring the voltage drop across the R_DS(ON) of the external power MOSFET. The MAX5938 integrates a 400mA fast GATE pulldown to guarantee that the external MOSFET is rapidly turned off in the event of an overcurrent or short-circuit condition.

The MAX5938 also protects the system against input voltage (V_IN) steps. During an input voltage step, the device limits the current drawn by the load to a safe level without shutting down the load. The device also includes ON/OFF control, selectable PGOOD output polarity, undervoltage (UV) and overvoltage (OV) protection.

The device offers latched (MAX5938L) or autoretry (MAX5938A) fault management. Both the MAX5938A and MAX5938L are available in a 16-pin QSOP package and are specified for the extended (-40°C to +85°C) temperature range.

Key Features

Applications/Uses

-10V to -80V Operation
No External R_SENSE Required
Drives Large Power MOSFETS
Eliminates Inrush Current Spikes During Hot Plug into Powered Backplane
Eliminates Inrush Current Spikes and Dropping of Load During Large V_IN Steps
Adjustable Circuit-Breaker Threshold with Temperature Compensation
Circuit-Breaker Fault with Transient Rejection
Shorted Load Detection (Load Probe) Before Power MOSFET Turn-On
Programmable Load-Voltage Slew Rate Controls Inrush Current
±2.4% Accuracy, Programmable Turn-On/Off Voltage (UVLO)
Overvoltage Fault Protection with Transient Rejection
Autoretry and Latched Fault Management Available
Low Quiescent Current (1mA)

	Network Hubs, Switches, Routers
	Network Hubs, Switches, Routers
	Servers
	Solid-State Circuit Breakers
	Telecom Line Cards

Key Specifications: Hot Swap Controllers

Part Number

Min. V_IN (V)

Max. V_IN (V)

Low Voltage

High Voltage

Voltage Polarity

Type

Fault Condition Control

Number of Channels

Features

Package

Price^**

MAX5938

-10

-80

Yes

Negative

Negative, High-Voltage

Periodic retry

•	400mA Gate Pulldown current

•	Auto-retry fault management

•	Immune to Input-Voltage Steps and Current Spikes

•	In-Rush Current and Short Circuit Protection

•	On/Off Control

•	Output Short Circuit Detection before Startup

•	Power-Good Output Programmable

QSOP/16

$1.40 @ 1k

See All Hot Swap Controllers (45)

Notes:
^**This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.